Look-Up Table Organization - Epson S1D13505 Technical Manual

Epson Research and Development
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4.2 Look-Up Table Organization

Display Mode
1 bpp gray
2 bpp gray
4 bpp gray
8 bpp gray
15 bpp gray
16 bpp gray
1 bpp color
2 bpp color
4 bpp color
8 bpp color
15 bpp color
16 bpp color
* On an active matrix panel the effective colors are determined by the interface width. (i.e. 9-bit=512, 12-bit=4096, 18-
bit=64K colors) Passive panels are limited to 12-bits through the Frame Rate Modulator.
Programming Notes and Examples
Issue Date: 01/02/05
• The Look-Up Table treats the value of a pixel as an index into an array of colors or gray
shades. For example, a pixel value of zero would point to the first LUT entry; a pixel
value of 7 would point to the eighth LUT entry.
• The value inside each LUT entry represents the intensity of the given color or gray
shade. This intensity can range in value between 0 and 0Fh.
• The S1D13505 Look-Up Table is linear; increasing the LUT entry number results in a
lighter color or gray shade. For example, a LUT entry of 0Fh into the red LUT entry will
result in a bright red output while a LUT entry of 5 would result in a dull red.
Table 4-1: Look-Up Table Configurations
4-Bit Wide Look-Up Table
RED
2
4
16
256
= Indicates the Look-Up Table is not used for that display mode
GREEN BLUE
2
4
16
16
2 2
4 4
16 16
256 256
Page 21
Effective Gray Shade/Colors
on an Passive Panel
2 gray shades
4 gray shades
16 gray shades
16 gray shades
16 gray shades
16 gray shades
2 colors
4 colors
16 colors
256 colors
4096 colors*
4096 colors*
S1D13505
X23A-G-003-07